Feature request (Devel): Add **kwargs support to object at_* hooks

[Griatch]

Description of requested feature:

The current Object hooks at_give, at_look etc have a fixed call sign, for example at_look(self, target). This feature request aims to expand their callsign with an, by default unused, **kwargs argument, so the new signature would be at_look(self, target, **kwargs).

Reasons for adding feature:

Adding an extra **kwargs allows the developer to inject custom extra arguments into the hook. This would not be used by default Evennia but could be of interest on a per-game basis. Adding a **kwargs also has the advantage of not affecting already existing code - if not included in the call it is just ignored.

Potentially many of the default hooks could benefit from the same flexibility (some already do).

Extra information, such as Evennia revision/repo/branch, operating system and ideas for how to solve / implement:

This is an API change slated for the Devel branch, leading up to Evennia 0.7.